prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006
           Family Brucellaceae Breed et al. 1957 (Approved Lists 1980)
             1 Genus Brucella Meyer and Shaw 1920 (Approved Lists 1980)
             2 Genus Crabtreella Xie and Yokota 2006 see Genus Shinella An et al. 2006
             3 Genus Daeguia Yoon et al. 2008
             4 Genus Falsochrobactrum Kämpfer et al. 2013
             5 Genus Mycoplana Gray and Thornton 1928 (Approved Lists 1980)
             6 Genus Ochrobactrum Holmes et al. 1988
             7 Genus Paenochrobactrum Kämpfer et al. 2010
             8 Genus Pseudochrobactrum Kämpfer et al. 2006